Search results for "Glass Poling"
showing 3 items of 3 documents
Poling Induced Mass Transport in Thin Polymer Films
2013
In this study we report investigation of the polymer film morphology modifications during their corona poling for fabrication of nonlinear optically (NLO) active materials. We demonstrate that at certain poling conditions surface and spatial inhomogeneities in the poled area of the sample appear. Densities of the inhomogeinities depend on the strength of the poling field, the sample temperature during the poling, and the prepoling conditions. Optimization of the poling conditions directed toward avoiding surface modifications enables us to increase the overall observable effective nonlinearity of the sample up to 10 times. To investigate, understand, and eventually explain the formation of …
Effect of Corona Poling and Thermo Cycling Sequence on NLO Properties of The Guest-Host System
2008
In the case of doped polymer system SHG efficiency is proportional to the concentration and orientation degree of NLO-active molecules. Unfortunately, corona poling realised at elevated temperatures causes concentration decrease of NLO-active molecules due to crystallization. On the basis of our studies of the film optical images, refractive index and SHG measurements of the dimethylaminobenzylidene 1,3-indandione and PMMA guest-host system, we have demonstrated that optical quality is improved and second order NLO efficiency is higher, when the external poling electric field is switched on from the very beginning of the sample heating process.
Chalcogenide Glasses Based on Germanium Disulfide for Second Harmonic Generation
2007
International audience; High second-order susceptibilities are created by thermal poling in bulk germanium disulfide based chalcogenide glasses. Experimental conditions of the poling treatment (temperature, voltage, time) were optimized for each glass composition. The second-order nonlinear signals were recorded by using the Maker fringes experiment and a second-order coefficient χ(2) up to 8 pm V-1 was measured in the Ge25Sb10S65 glass. This value is obtained using a simulation based on accurate knowledge of the thickness of the nonlinear layer. Two mechanisms are proposed to explain the creation of a nonlinear layer under the anode: the formation and the migration of charged defects towar…